Abstract: The carbonation of concrete is one of the main factors which effect the durability of concrete structure. In the paper, the stress_strain relationship of carbonation concrete was obtained by MTS81 5 servo_control tester. Compared with the normal concrete of the s ame strength grade, the peak value of the strain of the carbonized concrete is almost equal. But the ultimate compress ive strength of the carbonized concrete is increased by 16～26 percent than the normal concrete and the ultimate strain is decreased by about 20 percent. The reinforced concrete beams were quickly carbonized by means of artificial accelerated carbonation condition. The ultimate loads of carbonized beams and the uncarbonized beams were tested, and their flexural deformation performances were analyzed. Bas ed on test, the carbonized reinforced concrete beams were simulated with the ANSYS definite element program, and the results were compared with the experiment. s res ults .